I wonder if the the age on taking up the a martial discipline makes a difference? Ones character is more malleable at a younger age and you are less entrenched in ones attitudes and beliefs so the ideas behind Kendo, Karate-do Iaido etc can exert a more profound influence. Also, I don't know what I would've been like without the Budo since I started at an early age. Who knows, I may have been the same person without its influence, but I doubt it. The knowledge, instruction and reading I've gathered from the Budo and associated Japanese arts have made me a much more rounded person.